Felbook.Helpers.ImageHelper.ImageResize C# (CSharp) Method

        public void ImageResize(HttpPostedFileBase file, string filePath, int maximumWidth, int maximumHeight)
        {
            if (file != null && file.FileName != "")
            {
                int maxWidth = maximumWidth; //maximální šířka
                int maxHeight = maximumHeight; //maximální výška

                string strExtension = Path.GetExtension(file.FileName);
                if (strExtension.ToUpper() == ".JPG" || strExtension.ToUpper() == ".GIF" || strExtension.ToUpper() == ".PNG")
                {
                    // změní velikost obrázku
                    Image imageToBeResized = Image.FromStream(file.InputStream);
                    int imageHeight = imageToBeResized.Height;
                    int imageWidth = imageToBeResized.Width;
                    imageHeight = (imageHeight * maxWidth) / imageWidth;
                    imageWidth = maxWidth;

                    if (imageHeight > maxHeight)
                    {
                        imageWidth = (imageWidth * maxHeight) / imageHeight;
                        imageHeight = maxHeight;
                    }

                    Bitmap bitmap = new Bitmap(imageToBeResized, imageWidth, imageHeight);
                    bitmap.Save(filePath);
                }
            }
        }

        public ActionResult Edit(Felbook.Models.User model)
        {
            TryUpdateModel(CurrentUser);

            //upload změna profilového obrázku
            Felbook.Helpers.ImageHelper imageOperator = new Felbook.Helpers.ImageHelper(); //pomocná třída pro operace s obrázky
            HttpPostedFileBase imageToUpload = Request.Files["profileimage"];
            int userId = CurrentUser.Id;
            string fileDir = "../Web_Data/profile_images/";
            //název souboru je vždy stejný
            string fileName = "profileimage.png";
            string fileFullPath = Path.Combine(HttpContext.Server.MapPath(fileDir + userId), fileName);
            string fileDirPath = Path.GetDirectoryName(fileFullPath);
            bool uploadImage = false;

            if (imageToUpload.ContentLength == 0)
            {
                uploadImage = false;
            }
            else if (Felbook.Helpers.ImageHelper.IsImage(imageToUpload.ContentType))
            {
                uploadImage = true;
            }
            else
            {
                ModelState.AddModelError("file", "Your file wasn't image.");
            }

            if (model.OldPassword != null && String.Equals(model.Password, model.ConfirmPassword))
            {
                if (CurrentUser.CheckPassword(model.OldPassword))
                {
                    CurrentUser.ChangePassword(model.Password);
                }
                else
                {
                    ModelState.AddModelError("", "The password provided is incorrect.");
                }
            }

            if (ModelState.IsValid)
            {
                if (uploadImage == true)
                {
                    try
                    {
                        System.IO.File.Delete(fileFullPath);
                    }
                    catch (Exception)
                    {
                        ModelState.AddModelError("file", "Unexpected file error.");
                        return View("Index", "Profile", new { username = model.Username });
                    }
                    imageOperator.ImageResize(imageToUpload, fileFullPath, 90, 120);
                }

                Model.UserService.Edit(CurrentUser);
                return View("Index", "Profile", new { username = model.Username });
            }
            //v případě nějaké chyby se vrátí tohle
            return View("Edit", "../Profile", new { username = model.Username });
        }